From Wikipedia, the free encyclopedia

An espresso machine is used to produce the traditional Italian coffee beverage called espresso.

Generally, espresso is produced by forcing 90C (194F) water through 7-10 grams of finely ground coffee, which has been compressed with approximately 30 lbf (130 N) of force into a densely packed puck, at a pressure of 900 kPa (9 bars) or greater.

Since their invention in 1901, multiple machine designs have been created to produce espresso.  They generally share some common elements. The portafilter (or group handle) contains a metal filter-basket and holds the ground coffee.  It is locked under the group

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